创建中间件 logger.middleware.ts

import { Injectable, NestMiddleware, MiddlewareFunction } from '@nestjs/common'@Injectable()export class LoggerMiddleware implements NestMiddleware {  resolve(...args: any[]): MiddlewareFunction {    return (req, res, next) => {      console.log('收到请求：');      next();    }  }}

使用中间件 app.module.ts

import { Module, NestModule, MiddlewareConsumer, RequestMethod } from '@nestjs/common';import { AppController } from './app.controller';import { AppService } from './app.service';import { LoggerMiddleware } from './logger.middleware'@Module({  imports: [],  controllers: [AppController],  providers: [AppService],})export class AppModule implements NestModule {  configure(consumer: MiddlewareConsumer) {    consumer      .apply(LoggerMiddleware)      .forRoutes({        path: '*',        method: RequestMethod.ALL,       })  }}

函数 中间件

export function logger(req, res, next) {  console.log(`Request...`);  next();};---configure(consumer: MiddlewareConsumer) {    consumer      .apply(logger)      .forRoutes(CatsController);  }

全局使用

function logger(req, res, next) {  console.log('收到请求');  next();}const app = await NestFactory.create(ApplicationModule);app.use(logger);await app.listen(3000);

5到6的修改

// Before@Injectable()export class LoggerMiddleware implements NestMiddleware { resolve(...args: any[]): MiddlewareFunction {   return (req: Request, res: Response, next: Function) => {     console.log('Request...');     next();   }; }}// After@Injectable()export class LoggerMiddleware implements NestMiddleware {  use(req: Request, res: Response, next: Function) {    console.log('Request...');    next();  }}